Julia, Maxim and Agilent have some good papers on jitter, Tektronix has a good webinar series on jitter. I also suggest you look up information on the "dual-Dirac Model". Conrad Herse Alcatel-Lucent > Samit Ashdhir wrote: >> Hi Julia, >> >> A BER bathtub curve provides the relationship between the jitter spec >> and BER. The curve is the plot of BER vs. sample time from the left >> edge to the right edge of a data eye. This plot resembles a “bathtub” >> and is also referred to as a “BERT scan.” >> >> BER measurements is across the regions where data transitions occur >> (the left and right eye edges) and provide the necessary information >> to calculate TJ. TJ is quantified by noting the points where the BER >> reduces to 1E-12 (or required limit) at both eye edges. Subtracting >> that interval from the bit period provides TJ. For example, if the >> data rate is 1.25 Gb/s, the corresponding bit period is 800 ps. If a >> BER of 1E-12 occurs at 20 ps and 780 ps, then the total jitter is 800 >> – (780 – 20), or 40 ps. >> >> Agilent has some good papers explaining these more. >> >> -samit >> >> On Nov 9, 2010, at 5:08 PM, "Julia (Zhuyuan) Liu" <zliu@xxxxxxxxxx> >> wrote: >> >>> Hi, Everyone >>> XLAUI/ CAUI spec specifies the jitter tolerance in UI, assuming the >>> BER is 1e-12 or 1e-15. Does anyone know how to calculate the jitter >>> tolerance when the BER is given? >>> >>> For example, CAUI has the following note in the spec. >>> NOTE-A transmitter capable of operating at TJ = 0.3 UI and DJ = 0.16 >>> UI and receiver capable of operating at stress >>> jitter tolerance of TJ = 0.64 UI and DJ= 0.41 UI would have >>> sufficient margin for operation at approximately BER 10-15. >>> >>> >>> Thanks, >>> Julia >>> >>> >>> >>> >>> ________________________________ >>> Confidentiality Notice. >>> This message may contain information that is confidential or >>> otherwise protected from disclosure. If you are not the intended >>> recipient, you are hereby notified that any use, disclosure, >>> dissemination, distribution, or copying of this message, or any >>> attachments, is strictly prohibited. If you have received this >>> message in error, please advise the sender by reply e-mail, and >>> delete the message and any attachments. Thank you. >>> >>> ------------------------------------------------------------------ >>> To unsubscribe from si-list: >>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >>> >>> or to administer your membership from a web page, go to: >>> //www.freelists.org/webpage/si-list >>> >>> For help: >>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>> >>> >>> List technical documents are available at: >>> http://www.si-list.net >>> >>> List archives are viewable at: >>> //www.freelists.org/archives/si-list >>> >>> Old (prior to June 6, 2001) list archives are viewable at: >>> http://www.qsl.net/wb6tpu >>> >>> >> ------------------------------------------------------------------ >> To unsubscribe from si-list: >> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >> >> or to administer your membership from a web page, go to: >> //www.freelists.org/webpage/si-list >> >> For help: >> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >> >> >> List technical documents are available at: >> http://www.si-list.net >> >> List archives are viewable at: >> //www.freelists.org/archives/si-list >> >> Old (prior to June 6, 2001) list archives are viewable at: >> http://www.qsl.net/wb6tpu >> > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu